Permagreen triumph questions

I have done all my research and finally purchased a Perma Green Triumph. I took delivery a few days ago and have been testing it on my property. I have a few questions and need the input from actual users....not a salesman. I have been using a Lesco push for about 12 years and need to make the change....so here goes.

1. Which speed do most of you use. (high seems awfully fast to me)
2. When using the side deflector , do I need to worry about getting too much fert along driveways or sidewalks. (striping or burn)
3. On my push I ALWAYS left my third hold open.I am used to working that way. Will this hopper throw the same way?
4. Has anyone tried to change the spray nozzles for the wide spray so the spray pattern is as wide as the fert throw. ( it seems odd to that they don't already match)